linux-kernel - Re: [RFC][PATCH V2] GCOV: profile by modules

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Message-ID: <CAF12kFsxiBC3sqvHbp1i5HLXxDnvM2ApFSKGpu-hjGW9LBhd0A@mail.gmail.com>
Date:   Wed, 20 May 2020 17:04:54 +0800
From:   Cixi Geng <gengcixi@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     oberpar@...ux.ibm.com, linux-serial@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        jslaby@...e.com, Orson Zhai <orsonzhai@...il.com>,
        zhang.lyra@...il.com, Cixi Geng <cixi.geng1@...soc.com>
Subject: Re: [RFC][PATCH V2] GCOV: profile by modules

Thank you for guidances, I will fix error and upload new patch

Greg KH <gregkh@...uxfoundation.org> 于2020年5月20日周三 下午4:51写道：
>
> On Wed, May 20, 2020 at 04:38:21PM +0800, gengcixi@...il.com wrote:
> > From: Cixi Geng <cixi.geng1@...soc.com>
> >
> > ---
> > Replace symbol GCOV_PROFILE_MODULES with GCOV_PROFILE_PREREQS
> > ---
> > The CONFIG_GCOV_PROFILE_ALL will compile kernel by profiling entire
> > kernel which will lead to kernel run slower.Use GCOV_PROFILE_PREREQS
> > to control part of the kernel modules to open gcov.
> >
> > Only add SERIAL_GCOV for an example.
> >
> > Signed-off-by: Cixi Geng <cixi.geng1@...soc.com>
> > ---
> >  drivers/tty/serial/Kconfig  |  6 ++++++
> >  drivers/tty/serial/Makefile |  1 +
> >  kernel/gcov/Kconfig         | 14 ++++++++++++++
> >  3 files changed, 21 insertions(+)
> >
> > diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> > index adf9e80e7dc9..964df1a2989c 100644
> > --- a/drivers/tty/serial/Kconfig
> > +++ b/drivers/tty/serial/Kconfig
> > @@ -1566,3 +1566,9 @@ endmenu
> >
> >  config SERIAL_MCTRL_GPIO
> >       tristate
> > +
> > +config SERIAL_GCOV
> > +       bool "open gcov for serial"
>
> What do you mean by "open"?  And Kconfig entries are usually Upper Case" :)
>
> > +       depends on GCOV_PROFILE_PREREQS
> > +       help
> > +         Say Y here to enable gcov in serial.
>
> I think we need more text here.
>
>
> > diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
> > index d056ee6cca33..7be1202286d2 100644
> > --- a/drivers/tty/serial/Makefile
> > +++ b/drivers/tty/serial/Makefile
> > @@ -2,6 +2,7 @@
> >  #
> >  # Makefile for the kernel serial device drivers.
> >  #
> > +GCOV_PROFILE := $(CONFIG_SERIAL_GCOV)
> >
> >  obj-$(CONFIG_SERIAL_CORE) += serial_core.o
> >
> > diff --git a/kernel/gcov/Kconfig b/kernel/gcov/Kconfig
> > index 3941a9c48f83..91cc8f3c7c43 100644
> > --- a/kernel/gcov/Kconfig
> > +++ b/kernel/gcov/Kconfig
> > @@ -51,6 +51,20 @@ config GCOV_PROFILE_ALL
> >       larger and run slower. Also be sure to exclude files from profiling
> >       which are not linked to the kernel image to prevent linker errors.
> >
> > +config GCOV_PROFILE_PREREQS
> > +     bool "Profile Kernel subsytem"
> > +     depends on !COMPILE_TEST
> > +     depends on GCOV_KERNEL
> > +     default n
>
> default is always 'n', no need to list that
>
> > +     help
> > +     This options activates profiling for the specified kernel modules.
> > +
> > +     If unsure, say N.
> > +
> > +     When some modules need Gcov data, enable this config, then configure
> > +     with gcov on the corresponding modules configs.The directories or files
>
> '. '?
>
> > +     of these modules will be added profiling flags after kernel compile.
>
> The lines under "help" need to be indented more, right?
>
> thanks,
>
> greg k-h